Impregnated wood and process of making the same.



MAX LANDAYU, 01F BERLIN, GERMANY.

IMPJEtEGNATED T001? AND PROCESS OF MAKING THE SAME.

Specification of Letters Patent.

No Drawing.

. ful Improvement in Impregnatedl/Vood and the Process of Making the Same; and I do hereby declare the following to be a full, clear, and exact description of the same.

The present invention refers to a new impregnated. wood and the process of making the same.

The new impregnated wood consists of wood'containing polynitrophenols, the hydrogen of the phenol group being substituted by non-basic organic groups. The process of making the new impregnated wood consists in introducing polynitrophenols dissolved in a liquid or mixed with a liquid into wood. One has already proposed to impregnate wood for preserving the same with nitro-derivatives offthe phenols. T have now found that such derivatives of nitrophenols of the aromatic or naphthalene series, in which the hydrogen of the phenol group has been substituted by organic nonbasic groups, have a greatly higher fungicide and preserving property than the unsubstituted phenols. Such derivatives are for instance the acidylor allrybderivatives of the nitrophenols containing more than one nitro group, as the acetyldinitrophenol C H (N0 .OCOCltL formyldinitrophenol (1.,H (N0 tlC Oli, benzoyldinitrophenol (1 H, (N0 ().C()C.,l l methyldinitrophenol C H .,(NO OCH,, ethyldinitrophenol C li (N0 ,(lQH alphaacetyldinitronaphthol C, ,H .,(NO ..OCOCH,, acetyltrinitro-,

phenol C H (NO OCUCH,, the sulfonic acids of the said compounds. The acidylderivatives of polynitrophenols have a melting point below 100 degrees centigrade. One can use this property for preparing emulsions containing relatively small proportions of the-said acidylderivatives by heating the same with water and agitating the mixture. The acidyl and alkyl derivatives of the polynitrophenols are non-explosive, so that the dried impregnated woods may be employed in mines without any danger.

For carrying out my invention 1 shall describe the preparation of. the acetyldini- Patented dept. T2, 191%.

Application filed November 13, 1914. Serial No. 872,050.

trophenol and the manner of using it. 1

part by weight of dinitrophenol is mixed with 4: parts by weight of acetic anhydrid and :1 part by weight of fused sodium acetate and boiled for fl hours. The mass is then poured into cold water preferably containing ice. After some hours of standing a. cake of crystals is formed. One may separate the said crystals of acetyldinitrophe- 1101 from the water and use the raw product directly for impregnation. One may, however, carry out a further purification by dissolving the crude acetyldlnitrophenol in benzene and precipitating the acetyldinitrophenol by addition of ligroin. The pure acetyldinitrophenol has the melting point of 64 de rees centigrade, it is soluble in alcohol, ether, benzene, insoluble in ligroin.

For carrying out the impregnation of wood one mixes 1 part by weight with 1000 parts by weight of water at degrees centigrade and agitates the mixture for emulsifying the molten acetyldinitrophenol. The

mixture can be introduced into the wood by pressure maintaining the liquid at temperatures at which the acetyldinitrophenol will be molten. The'wood-may be subjected to vacuum before the impregnation and the liquid is introduced at atmospheric. pressure or at a higher pressure.

Another method consists in dissolving acctyldinitrophenol in tar oils, benzene or mineral oils and in introducing the liquid into the wood by pressure, if desired after previously subjecting to the wood vacuum.

In using aqueous liquid one may add fireproofing inorganic salts in order to diminish the inflanunability of the impregnated wood. Such salts are for instance: sodium chlorid, potassium sulfate, magnesium chlorid, magnesium sulfate.

Another new derivative of dinitrophenol suitable for my purpose is formyldinitrophenol. It may be prepared in the following way: 1 part by weight of dinitrophenol or of its sodium salt is mixed with 3 parts i :aromati'c organlc groups.

. water may be purified by crystallization from benzene. The melting point is degrees centigrade.

In order topreparebenzoyldinitrophenol one heats one part by weight of dinitrop'henol and parts by Weight of benzoylchlorid to about 110 degrees centigrade. The p1'0d uct of the reactionis poured into water and fl maybe'purifiedby washing. with a solutionv gem benzene. The melting point is 135 of sodium'carbonate and may be crystallized d'g reescentrigrade.

" 1"The. impregnation of {the wood is effected as described.hereinbefore.

'Under the term polyni'trophenol I understand the nitrophenols having more than -conefi nitro group and also such nitrophenols having other groups besides the nitrd group or instance the sulfonic group SO H.

claim: I

Impregnated wood containing olyfgroup being substituted by non-basic non- 2. Impregnated wood containing poly- -3. The method mpregnating wood which consists in introducing thereinto nitrophcnols the hydrogen of the 'p enol.

i'trophenols' thehydrogen of the phenol .-g'roup beingsubstituted by organic acid polynitrophenols the hydrogen of the plienol group being substituted by non-basic, non-aromatic organic groups.

4. The method of impregnating wood which consists in introducing a mixture of a liquid and of ,polynitrophenols the hydrogen of the phenol group being substituted by non-basic, non-aromatic organic groups. 5; The method of impregnating wood -which consists in introducing a mixture of polynitrophenols the hydrogen of the phenol aromatic organic groups and of a liquid heated above the temperature at which the said derivatives of the polynitrophenols melt.

6. The method of impregnating 'wood which consists in introducing .a mixture of polynitrophenols the' hydrogen of the phenol group being substituted by non-basic, non-aromatic organic groups of aliquid and of an inorganic fireproofing salt.

of'two subscribing witnesses.

7 MAX LANDAU.

Witnesses: t

HENRY HAsrnn, WOLDEMAR HAUPT.

group belng substituted by non-basic, non- In testimony whereof, I have signed my name to this specification in the presence 

